180 Lacertidx. 



Head-shields normal, but occipital sometimes absent. 

 Nostril pierced between an upper and a lower nasal and 

 a postnasal. Lower eyelid scaly. Collar absent; a 

 short fold in front of the arm. Back covered with large 

 rhombic or lanceolate, strono-ly keeled and imbricate 

 scales ; ventral plates smooth, imbricate. Digits feebly 

 compressed, with sharply keeled lamella? inferiorly. 

 Femoral pores. Tail long, cylindrical. 



Tropical and South Africa. 



The parietal foramen and pterygoid teeth are present. 



This genus may be regarded as derived from Tropidosaura, differing 

 only in the keeled subdigital lamellae combined with the presence of a 

 subnasal separating the nasal from the first upper labial ; but it must 

 be borne in mind that the latter difference is no greater than between 

 species united in the same genus under Cahrita and Opliiops. 



Synopsis of the Species. 



I. Frontonasal single ; sixbocular usually bordering- the moutli ; 

 occipital usually present ; 34 to 40 scales and plates round 

 middle of body ; 8 to 13 (rarely 15) femoral j)ores on each 

 side. 



A. A single anterior loreal. 

 Upper head-shields rather feebly striated ; prefrontal in contact 

 with the anterior of the two large supraoculars, which are in 

 contact with superciliaries ; hind limb reaching a little beyond 

 the shoulder in males . . . . . I. tanganicana, Blgr., p. 181. 



Upper head- shields strongly striated and keeled ; pi'efrontal 

 usually in contact with the anterior of the two large supra- 

 oculars, which are sexaarated from the superciliaries by small 

 scales ; hind limb reaching axil or shoulder in males. 



/. hivittata. Socage, p. 182. 

 Upper head-shields strongly striated ; prefrontal not reaching 

 the anterior of the two large supraoculars, which is as long- 

 as or a little shorter than its distance from the second 

 loreal; a series of small scales between supraoculars and 

 superciliaries ; hind limb reaching between shoulder and ear 

 in males ......../. capeyisis, A. Smith, p. 185. 



Upper head-shields strongly striated ; prefrontal not reaching 

 the anterior of the two large supraoculars, which is longer 

 than its distance from the second loreal ; a series of small 

 scales between supraoculars and superciliaries; hind limb 

 reaching ear or between ear and eye in males I. longipes, Blgr., p. 188. 



